块和属性

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1. 1. 块的新增
6. cstring blkname;
8. //获取当前图形数据库
10. AcDbBlockTable* pBlkTbl = NULL;
12. acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTbl,AcDb::kForWrite);
14. //创建新的块表记录
16. AcDbBlockTableRecord *pBlkTblRcd = new AcDbBlockTableRecord();
18. //根据块名称，添加到块表中
20. pBlkTblRcd->setName(blkname);
22. AcDbObjectId blkDefId;
24. pBlkTbl->add(blkDefId,pBlkTblRcd );
26. pBlkTbl->close();
28. //项块表记录中添加实体
30. AcGePoint3d ptStart(-10,0,0),ptEnd(10,0,0);
32. AcDbLine *pLine1 = new AcDbLine(ptStart,ptEnd);
34. ptStart.set(0,-10,0);
36. ptEnd.set(0,10,0);
38. AcDbLine *pLine2 = new AcDbLine(ptStart,ptEnd);
43. AcDbObjectId entId;
45. pBlkTblRcd->appendAcDbEntity(entId,pLine1);
47. pBlkTblRcd->appendAcDbEntity(entId,pLine2);
49. //关闭
51. pLine1->close();
53. pLine2->close();
55. pBlkTblRcd->close();
63.   2. 快参照
65.   块定义和块参照(AcDbBlockReferende) 是两个概念,块定义不一定是一个实体，而是一种对实体的描述，通过定义块获得块参照则是一种实体，图形中显示的“块”都是快参照，通过插入块获得。
67.   在ObjectARX中块定义通过块表记录来保存，而块参照由AcDbBlockReference来来表示。既然快参照是一个实体，那么创建块参照的过程与创建一条直线似乎不应该有什么区别？事实的确如此。
72. cstring blkname;
74. //获取当前图形数据库
76. AcDbBlockTable* pBlkTbl = NULL;
78. acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTbl,AcDb::kForWrite);
80. //查询块是否已存在
82. if(pBlkTbl->has(blkname))
84. return ;
86. //获取块的插入点
88. AcGePoint3d ptInsert(0,0,0);
90. //获取块表记录
92. AcDbObjectId blkDefId;
94. pBlkTbl->getAt(blkname,blkDefId);
96. pBlkTbl->close();
98. //创建快参照
100. AcDbBlockReference *pBlkRef = new AcDbBlockReference(ptInsert,blkDefId);
102. //将块参照添加到模型空间
104. CDwgDatabaseUtil::PostToModelSpece(pBlkRef );
109. pBlkRef->close();
114.   3. 创建带有属性的块定义
116. cstring blkname;
118. //获取当前图形数据库
120. AcDbBlockTable* pBlkTbl = NULL;
122. acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTbl,AcDb::kForWrite);
124. //创建新的块表记录
126. AcDbBlockTableRecord *pBlkTblRcd = new AcDbBlockTableRecord();
128. //根据块名称，添加到块表中
130. pBlkTblRcd->setName(blkname);
132. AcDbObjectId blkDefId;
134. pBlkTbl->add(blkDefId,pBlkTblRcd );
136. pBlkTbl->close();
138. //项块表记录中添加实体
140. AcGePoint3d ptStart(-10,0,0),ptEnd(10,0,0);
142. AcDbLine *pLine1 = new AcDbLine(ptStart,ptEnd);
144. ptStart.set(0,-10,0);
146. ptEnd.set(0,10,0);
148. AcDbLine *pLine2 = new AcDbLine(ptStart,ptEnd);
153. //创建一个属性
155. AcDbAttributeDefinition *pAtterDef = new AcDbAttributeDefinition(ptEnd,TEXT("20"),TEXT("直径"),TEXT("输入直径"));
160. AcDbObjectId entId;
162. pBlkTblRcd->appendAcDbEntity(entId,pLine1);
164. pBlkTblRcd->appendAcDbEntity(entId,pLine2);
166. pBlkTblRcd->appendAcDbEntity(entId,pAtterDef );
168. //关闭
170. pLine1->close();
172. pLine2->close();
174. pBlkTblRcd->close();

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